Question

我正在尝试使用广播接收器检测互联网连接，我已经动态注册了广播接收器，但是当应用启动时，它显示以下错误：

initState

我想重定向到另一个活动，该活动在没有Internet连接时不显示网络消息。

下面是我的代码：

ConnectivityReceiver.java

 java.lang.IllegalArgumentException: Receiver not registered: com.app.qrius.ConnectivityReceiver@3240fd8

MainActivity.java

public class ConnectivityReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {

    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

    if(networkInfo != null){

        Toast.makeText(context,"On",Toast.LENGTH_SHORT).show();
    }
    else{
         Intent i = new Intent(context,Network.class);
         context.startActivity(i);
        ((Activity)context).finish();
    }
}

请让我知道我做错了什么，我们将不胜感激。

谢谢

Answer 1

您需要将其添加到AndroidManifest.xml

类似于：

        <receiver
        android:name=".BatteryPowerBroadcastReceiver"
        android:enabled="true"
        android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.ACTION_POWER_CONNECTED" />
            <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED" />
            <action android:name="android.intent.action.BATTERY_LOW" />
            <action android:name="android.intent.action.BATTERY_OKAY" />
            <action android:name="android.intent.action.DOCK_EVENT" />
        </intent-filter>
    </receiver>

Answer 2

对于register和unregister广播接收者，您应按以下方式更改活动。您可以为此使用LocalBroadcastManager。

    public class MainActivity extends AppCompatActivity {
   
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
      }
    
    
    @Override
    protected void onResume() {
        // Register to receive messages.
        // We are registering an observer (mMessageReceiver) to receive 
        //  Intents
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");

        LocalBroadcastManager.getInstance(this).registerReceiver(
                mMessageReceiver, intentFilter);
        super.onResume();
    }
    
    @Override
    protected void onPause() {
        // Unregister since the activity is paused.
        LocalBroadcastManager.getInstance(this).unregisterReceiver(
                mMessageReceiver);
        super.onPause();
    }


    // Our handler for received Intents. This will be called whenever an Intent
    // with an action named "custom-event-name" is broadcasted.
    private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub
            // Get extra data included in the Intent
            
            ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

    if(networkInfo != null){

        Toast.makeText(context,"On",Toast.LENGTH_SHORT).show();
    }
    else{
         Intent i = new Intent(context,Network.class);
         context.startActivity(i);
        ((Activity)context).finish();
    }
        }

    };

}

有关更多信息，请check

无法注册广播接收器

2 个答案: